Why we use potassium dichromate in control of absorbance in uv
region and copper sulphate in control of absorbance in visible
region?
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Explain the process of spontaneous combustion?
why is acetic acid less conductive than hcl?
Why does a pencil look cracked, when partly immersed in water ?
Does domestic/household used kerosene oil which is available in blue color (In India) can change its color over the due course of time say 8-10 years if keeping in plastic bottle? If so, in which color it will be turned to change, yellow or transparent or any other color. Please provide me the reply with strong technical approach. Since it has been asked during an interview. Please reply fast. I will be thankful to you if anyone can provide the supporting journals/write-ups/reference to favour of response.
Why does a freely suspended magnetic needle always point North and South ?
What is the composition of gun-powder ?
Why are some wires covered with insulating materials ?
What is OOS AND OOT?
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While standing on railway platform and heating the whistle of an engine coming towards us , we hear the sound increasing; bit when the engine is receding from us it appears to fall why ?
What will happen when a big piece of quick lime is dropped in water ?
What is an alloy ?
What is the Chemical Combination ?